Creatures can not attack (or tap to activate abilities) the turn they enter the battlefield unless they have haste
For all other Collector Boosters, these cards appear in English two thirds of the time and Japanese one third of the time
If you can survive with even ten HP, then you get a free turn to potentially heal, set up a follow-up or even knock out your foe instead
So how come the Trading Card Game format an already-established game in its own right that has shifted a staggering 30.4 billion cards over the last twenty-five years has been used so little
Its a decent enchantment at five mana to start taxing your opponents, and its really strong in pox/discard-based Commander decks with commanders like Tinybones, Trinket Thief
In addition, I've written a second article that goes into more complete detail on each product's contents